How get installed printers list?

i try run get installed printers with chrome-extension https://github.com/GoogleChrome/chrome-extensions-samples/blob/719d5b205ca45b70f5a36f5b60362ce3bd7c7c06/mv2-archive/api/printing/printers.js

But its show errors.

printers.js:55 Uncaught TypeError: Cannot read property 'getPrinters' of undefined
    at createPrintersTable (printers.js:55)
    at HTMLDocument.<anonymous> (printers.js:98)
createPrintersTable @ printers.js:55
(anonymous) @ printers.js:98